noun
J-Alert; nationwide instantaneous alert system
Japan's satellite-based early warning system that instantly disseminates emergency information (earthquakes, tsunamis, missile threats, etc.) to the public via local governments and media.
See also: Ｊアラート
The nationwide instantaneous alert system (J-Alert) instantly conveys emergency information such as earthquakes and tsunamis.
全国瞬時警報システムが作動したら、すぐに安全な場所へ避難してください。
If the nationwide instantaneous alert system activates, evacuate to a safe place immediately.